There is alot of people i see that have one of the Fastman TB's. And it seems like the MPG for these people is terrible. Is it just me or what. My question is Does the Fastman Throttle Body upgrade greatly decrease MPG.

 

It all depends on how you position your right foot after the install. I saw no gain or loss in mpg w/ the 52mm on my 360.

 

I did the Fastman TB and a Flowmaster muffler in the same week, and saw a solid 2 mpg increase. I have read other post were people saw 2-3 mpg increases with the TB install. You won't see any increase though if you put your foot into it more, which will be the temptation after you install it. It's a great mod.

 

I ordered my Fastman T-body last week. He is currently a couple weeks behind demand.

I should hopefully see it soon. I am pretty excited after reading the results other people have had with it.

I just finished bolting up a complete exhaust (headers back) and noticed a 2mpg increase around town. I have not gotten to go on a long highway trip yet to test highway mpg.

My cat was broken apart on my old exhaust which I am sure did not help.

 

Seen no increase or decrease using the Fastman, much better throttle response.

 

what do you guys mean by "throttle response"???

 

Much smoother acceleration, the stock TB is kind of a dog with the way it takes off. Much less foot pressure on the Fastman to get up to speed. Best thing you can do is when you get the new one take your truck out for a spin, pay close attention to how it accelerates, then come home and change it out, take it for another spin when your done.